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Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2013
Investment Securities [Abstract] |
Amortized Cost and Fair Value of Available-for-Sale Investment Securities | The amortized cost and fair value of available-for-sale investment securities at March 31, 2013 and December 31, 2012 are summarized as follows (in thousands):
|  | March 31, 2013 |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
U.S. Treasury notes |  | $ | 19,447 |  |  |  | 246 |  |  |  | - |  |  |  | 19,693 |
U.S. Agency notes |  |  | 100,668 |  |  |  | 1,021 |  |  |  | 190 |  |  |  | 101,499 |
U.S. Agency mortgage-backed securities |  |  | 53,116 |  |  |  | 1,166 |  |  |  | 126 |  |  |  | 54,156 |
Certificates of deposit with other banks |  |  | 1,494 |  |  |  | 15 |  |  |  | - |  |  |  | 1,509 |
Municipal securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-taxable |  |  | 75,766 |  |  |  | 3,157 |  |  |  | 179 |  |  |  | 78,744 |
Taxable |  |  | 16,684 |  |  |  | 919 |  |  |  | 11 |  |  |  | 17,592 |
Mutual funds |  |  | 2,201 |  |  |  | 22 |  |  |  | - |  |  |  | 2,223 |
Trust preferred securities |  |  | 149 |  |  |  | 3 |  |  |  | 4 |  |  |  | 148 |
Equity securities |  |  | 1,751 |  |  |  | 261 |  |  |  | 17 |  |  |  | 1,995 |
|  | $ | 271,276 |  |  |  | 6,810 |  |  |  | 527 |  |  |  | 277,559 |
|  | December 31, 2012 |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
U.S. Treasury notes |  | $ | 18,462 |  |  |  | 224 |  |  |  | - |  |  |  | 18,686 |
U.S. Agency notes |  |  | 89,372 |  |  |  | 1,364 |  |  |  | 130 |  |  |  | 90,606 |
U.S. Agency mortgage-backed securities |  |  | 51,121 |  |  |  | 1,444 |  |  |  | 24 |  |  |  | 52,541 |
Corporate securities |  |  | 3,032 |  |  |  | 35 |  |  |  | - |  |  |  | 3,067 |
Municipal securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-taxable |  |  | 70,504 |  |  |  | 3,497 |  |  |  | 119 |  |  |  | 73,882 |
Taxable |  |  | 14,851 |  |  |  | 993 |  |  |  | 3 |  |  |  | 15,841 |
Mutual fund |  |  | 2,138 |  |  |  | 30 |  |  |  | - |  |  |  | 2,168 |
Trust preferred securities |  |  | 250 |  |  |  | 2 |  |  |  | 7 |  |  |  | 245 |
Equity securities |  |  | 1,390 |  |  |  | 106 |  |  |  | 26 |  |  |  | 1,470 |
|  | $ | 251,120 |  |  |  | 7,695 |  |  |  | 309 |  |  |  | 258,506 |
Securities in a Continuous Loss Position | Information concerning securities with gross unrealized losses at March 31, 2013, aggregated by length of time that individual securities have been in a continuous loss position, is as follows (in thousands):
|  | Less than Twelve Months |  |  | Twelve Months or More |
|  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
U.S. Agency notes |  | $ | 23,040 |  |  |  | 190 |  |  |  | - |  |  |  | - |
U.S. Agency mortgage-backed securities |  |  | 11,255 |  |  |  | 126 |  |  |  | - |  |  |  | - |
Municipal securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-taxable |  |  | 13,130 |  |  |  | 178 |  |  |  | 453 |  |  |  | 1 |
Taxable |  |  | 1,922 |  |  |  | 11 |  |  |  | - |  |  |  | - |
Mutual funds |  |  | 57 |  |  |  | - |  |  |  | - |  |  |  | - |
Trust preferred securities |  |  | 47 |  |  |  | 3 |  |  |  | 49 |  |  |  | 1 |
Equity securities |  |  | 111 |  |  |  | 3 |  |  |  | 101 |  |  |  | 14 |
|  | $ | 49,562 |  |  |  | 511 |  |  |  | 603 |  |  |  | 16 |

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- Definition Tabular disclosure of fair value of investments in debt and equity securities in an unrealized loss position categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27198-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19, 20, 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 + Details
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